Rec. Itu-r bt. 1549

Data link protocol for interaction channel

(Question ITU‑R 16/6)

(2001)
The ITU Radiocommunication Assembly,

a) the progress in information processing and communication technologies;

b) the rapid progress towards enhanced and digital television delivery systems;

c) the need within such systems for interactivity for a variety of purposes;

d) the development of communication methods, over various delivery media, suitable for use in receiving, from viewers, return communications related to the programme material (vision, sound and data);

e) the availability of mass storage media permitting interaction without the requirement of a return channel;

f) the large number of domestic receivers likely to be impacted by the adoption of interactive services;

g) the large number of domestic multimedia systems likely to be impacted by the adoption of interactive services;

h) that return information from viewers can be also provided in a non-automatic way (viewers have to store and then take care of the delivery of the information);

j) the existence of Recommendation ITU-R BT.1369 – Basic principles for a worldwide common family of systems for the provision of interactive television services;

k) the need for simpler protocols than Recommendation ITU-R BT.1434, which supports Internet protocol (IP)‑based protocols, such that the introduction of interactive services using a return channel might be more easily achieved;

l) that public switched telephone network (PSTN)/integrated services digital network (ISDN) is one of most generic interaction channels in many countries;

m) the requirement that the simpler protocols should also support a simple level of the security,

recommends

1 that the data link layer protocol for the interaction channel, specified in Annex 1, should be applied when using a low data rate modem and simple data transfer protocols.

ANNEX 1

1 Scope

This Recommandation specifies the data link layer protocol which can be applied when using a low data rate modem and a simple data transfer protocol for the interaction channel (i.e. non IP-based protocols such as high level data link control (HDLC) (ISO 3309, 4335, 7809), basic mode control procedure for data communication systems (ISO 1745), etc.).

2 Normative references

ITU-T Recommendation X.28 – DTE/DCE interface for a start-stop mode Data Terminal Equipment accessing the Packet Assembly/Disassembly facility (PAD) in a public data network situated in the same country.

3 Reference models

3.1 Assumed connection model for interactive systems

An assumed connection model for interactive systems to which this link layer protocol can be applied is shown below.

NOTE 1 – The model is compliant with the system model of ITU-T Recommendation J.110, and matches the logical model of ITU-T Recommendation J.111 with the exception that the S2 channel for data downloading is not used.

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